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Berserker's True Name is Eric Bloodaxe (エイリーク・ブラッドアクス,Eirīku Buraddoakusu?) the Bloodaxe King (血斧王,Chiono-Ō?), a Viking king known for possessing a bloodied axe. Having ruled over Norway during the 9th century, he made his nickname well known with his brutality in massacring his siblings to claim the throne and his just-as-infamous wife, the witch Gunnhild, being rumored to support him. His reign lasted for only slightly over three years, when he was driven out and escaped to England to become a mere provincial feudal lord.[1]

Due to his Mad Enhancement having reached B-rank, reaching mutual understanding is fundamentally impossible, but occasionally his wife's voice can be heard from nowhere.[1] Gunnhild is able to interact through Berserker in some unknown manner by speaking with his body, claiming that she would normally kill a Master for daring to use her husband for something like a regular Holy Grail War. Due to the unique circumstances of humanity being in danger, she permits Berserker's Master to utilize her husband.[2] Berserker's Master is urged to listen to her should the wish to keep being his Master.[1]

Berserker possesses the skill Supporting Shamanism (支援呪術,Shien Jujutsu?), a curse from Gunnhild that causes the parameters of his opponents to be decreased by one rank.[1] His Noble Phantasms are his Blood-sipping Bestial Axe‎‎ and Bloodbath Crown.

Level 2 Bond
Eric is a king who ruled over Norway during the 9th Century. That being said, he only reigned as a king for little more than three years. After being driven out from the throne, he escaped to England and became a mere provincial feudal lord.

Level 3 Bond
Nevertheless, what caused his nickname to become well-known was the brutality of massacring his siblings in order to ascend to the throne and the existence of the witch Gunnhild, who was rumored to have supported him.

Level 4 Bond

Supporting Shamanism: C

Causes the stats of opponents to suffer a 1 Rank-DOWN.
A curse from Gunnhild, female magus as infamous as her husband.

Level 5 Bond
"Blood-sipping Beastial Axe"
Rank: C Type: Anti-Unit Noble Phantasm
A Magic Beast he once defeated was processed and made out into an axe. It seems that this Magic Beast that was processed into an axe is still alive, and has been surviving by sipping blood.

Interlude
Because this is a Servant whose Mad Enhancement has reached B Rank, mutual understanding is fundamentally impossible. However, sometimes the words of his wife suddenly comes raining down out of the nowhere. In order to keep being his Master, it is crucial to properly lend a ear to those words.